Resumo

DIAZ VALDES, Tomás et al. Efficient water use and optimal production in corn, using four doses of nitrogen. Rev Cie Téc Agr [online]. 2014, vol.23, n.1, pp.32-36. ISSN 2071-0054.

Intensive corn production in semiarid areas is mainly based on water and nitrogen fertilization in order to increase the income for producers and to reduce the pollution of the waters which belong to agricultural areas. This paper is aimed at determining the water use efficiency and the optimal dose of nitrogen through the use of four doses of nitrogen in corn. The experiment was carried out in Sinaloa, Mexico. The experimental design was a randomize block with four repetitions. There were several treatments as control (0), 150, 300, 450 and 600 kg of N•ha^-1. The evaluated variables were water use efficiency (WUE), harvest index (HI), and grain yield. In doses of 300 kg and 450kg of N•ha^-1 there was a positive effect as to WUE, HI and grain yield. The optimal dose of N was 477 kg N•ha^-1, which caused a maximum yield of 9, 89 Mg•ha^-1. The optimal economic dose was 341 kg N•ha^-1, with a yield of 9, 44 Mg•ha^-1.

Palavras-chave : Zea Mays L.; harvest index; yield optimum.

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